Fixing compiler flags checks.

CMakeLists.txt

@@ -287,13 +287,13 @@ endif()
 # ----------------------------------------------------------------------------
 # OpenCV compiler and linker options
 # ----------------------------------------------------------------------------
-include(cmake/OpenCVCompilerOptions.cmake REQUIRED)
-
 # In case of Makefiles if the user does not setup CMAKE_BUILD_TYPE, assume it's Release:
 if(CMAKE_GENERATOR MATCHES "Makefiles|Ninja" AND "${CMAKE_BUILD_TYPE}" STREQUAL "")
   set(CMAKE_BUILD_TYPE Release)
 endif()
 
+include(cmake/OpenCVCompilerOptions.cmake REQUIRED)
+
 
 # ----------------------------------------------------------------------------
 # Use statically or dynamically linked CRT?

cmake/OpenCVCompilerOptions.cmake

@@ -33,12 +33,15 @@ set(OPENCV_EXTRA_EXE_LINKER_FLAGS_RELEASE "")
 set(OPENCV_EXTRA_EXE_LINKER_FLAGS_DEBUG "")
 
 macro(add_extra_compiler_option option)
-  ocv_check_flag_support(CXX "${option}" _varname ${ARGN})
+  if(CMAKE_BUILD_TYPE)
+    set(CMAKE_TRY_COMPILE_CONFIGURATION ${CMAKE_BUILD_TYPE})
+  endif()
+  ocv_check_flag_support(CXX "${option}" _varname "${OPENCV_EXTRA_CXX_FLAGS} ${ARGN}")
   if(${_varname})
     set(OPENCV_EXTRA_CXX_FLAGS "${OPENCV_EXTRA_CXX_FLAGS} ${option}")
   endif()
 
-  ocv_check_flag_support(C "${option}" _varname ${ARGN})
+  ocv_check_flag_support(C "${option}" _varname "${OPENCV_EXTRA_C_FLAGS} ${ARGN}")
   if(${_varname})
     set(OPENCV_EXTRA_C_FLAGS "${OPENCV_EXTRA_C_FLAGS} ${option}")
   endif()